<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="toggleShow">
          <div class="logo-wrapper">
            <div class="logo" :class="{highlight: totalCount}">
              <i class="iconfont icon-shopping_cart" :class="{highlight: totalCount}"></i>
            </div>
            <div class="num" v-if="totalCount">{{totalCount}}</div>
          </div>
          <div class="price" :class="{highlight: totalCount}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{info.deliveryPrice}}元</div>
        </div>
        <div class="content-right">
          <div class="pay" :class="payClass">
            {{payText}}
          </div>
        </div>
      </div>
      <transition name="move">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="clearCart">清空</span>
          </div>
          <div class="list-content">
            <ul>
              <li class="food" v-for="(food, index) in cartFoods" :key="index">
                <span class="name">{{food.name}}</span>
                <div class="price"><span>￥{{food.price}}</span></div>
                <div class="cartcontrol-wrapper">
                  <CartControl :food="food"/>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>

    </div>
    <div class="list-mask" v-show="listShow" @click="toggleShow"></div>
  </div>
</template>

<script>
  import { MessageBox } from 'mint-ui'
  import BScroll from 'better-scroll'
  import {mapState, mapGetters} from 'vuex'
  import CartControl from '../CartControl/CartControl.vue'

  export default {
    data () {
      return {
        isShow: false
      }
    },

    computed: {
      ...mapState(['cartFoods', 'info']),
      ...mapGetters(['totalCount', 'totalPrice']),
      payClass () {
        const {totalPrice} = this
        const {minPrice} = this.info

        return totalPrice>=minPrice ? 'enough' : 'not-enough'
      },
      payText () {
        const {totalPrice} = this
        const {minPrice} = this.info
        if(totalPrice===0) {
          return `￥${minPrice}元起送`
        } else if(totalPrice<minPrice) {
          return `还差￥${minPrice-totalPrice}元起送`
        } else {
          return '结算'
        }
      },

      listShow () {
        // 如果总数量为0, 直接不显示
        if(this.totalCount===0) {
          this.isShow = false
          return false
        }
         
        if(this.isShow) {
          this.$nextTick(() => {
            // 实现BScroll的实例是一个单例
            if(!this.scroll) {
              this.scroll= new BScroll('.list-content', {
                click: true
              })
              // console.log(this.scroll,1);
            } else {
              this.scroll.refresh() // 让滚动条刷新一下: 重新统计内容的高度
             
            }
          
              
              
              // this.scroll = new BScroll('.list-content', {
              //   click: true
              // })
       

            
          })
        }

        return this.isShow
      }
    },


    methods: {
      toggleShow () {
        // 只有当总数量大于0时切换
        if(this.totalCount>0) {
          this.isShow = !this.isShow
        }
      },

      clearCart () {
        MessageBox.confirm('确定清空购物车吗?').then(action => {
          this.$store.dispatch('clearCart')
        }, () => {});
      }
    },
    components: {
      CartControl
    }
  }
</script>

<style lang="scss"  scoped>
  @import "../../common/style/style.scss";

  .shopcart {
  position: fixed;
  left: 0;
  bottom: 0;
  z-index: 50;
  width: 100%;
  height: 48px;.content {
    display: flex;
    background: #141d27;
    font-size: 0;
    color: rgba(255, 255, 255, 0.4);.content-left {
      flex: 1;.logo-wrapper {
        display: inline-block;
        vertical-align: top;
        position: relative;
        top: -10px;
        margin: 0 12px;
        padding: 6px;
        width: 56px;
        height: 56px;
        box-sizing: border-box;
        border-radius: 50%;
        background: #141d27;.logo {
          width: 100%;
          height: 100%;
          border-radius: 50%;
          text-align: center;
          background: #2b343c;&.highlight {
            background: $green;
          }.icon-shopping_cart {
            line-height: 44px;
            font-size: 24px;
            color: #80858a;&.highlight {
              color: #fff;
            }
          }
        }.num {
          position: absolute;
          top: 0;
          right: 0;
          width: 24px;
          height: 16px;
          line-height: 16px;
          text-align: center;
          border-radius: 16px;
          font-size: 9px;
          font-weight: 700;
          color: #ffffff;
          background: rgb(240, 20, 20);
          box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4);
        }
      }.price {
        display: inline-block;
        vertical-align: top;
        margin-top: 5px;
        line-height: 24px;
        padding-right: 12px;
        box-sizing: border-box;
        font-size: 16px;
        font-weight: 700;
        color: #fff;&.highlight {
          color: #fff;
        }
      }.desc {
        display: inline-block;
        vertical-align: bottom;
        margin-bottom: 15px;
        margin-left: -45px;
        font-size: 10px;
      }
    }
    .content-right {
      flex: 0 0 105px;
      width: 105px;
      .pay {
        height: 48px;
        line-height: 48px;
        text-align: center;
        font-size: 12px;
        font-weight: 700;
        color: #fff;&.not-enough {
          background: #2b333b;
        }&.enough {
          background: #00b43c;
          color: #fff;
        }
      }
    }
  }.ball-container {
    .ball {
      position: fixed;
      left: 32px;
      bottom: 22px;
      z-index: 200;
      transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41);.inner {
        width: 16px;
        height: 16px;
        border-radius: 50%;
        background: $green;
        transition: all 0.4s linear;
      }
    }
  }.shopcart-list {
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    width: 100%;
    transform: translateY(-100%);
    &.move-enter-active, &.move-leave-active {
      transition: transform 0.6s;
    }&.move-enter, &.move-leave-to {
      transform: translateY(0);
    }.list-header {
      height: 40px;
      line-height: 40px;
      padding: 0 18px;
      background: #f3f5f7;
      border-bottom: 1px solid rgba(7, 17, 27, 0.1);.title {
        float: left;
        font-size: 14px;
        color: rgb(7, 17, 27);
      }.empty {
        float: right;
        font-size: 12px;
        color: rgb(0, 160, 220);
      }
    }.list-content {
      padding: 0 18px;
      max-height: 217px;
      overflow: hidden;
      background: #fff;.food {
        position: relative;
        padding: 12px 0;
        box-sizing: border-box;
        @include bottom-border-1px(rgba(7, 17, 27, 0.1));.name {
          line-height: 24px;
          font-size: 14px;
          color: rgb(7, 17, 27);
        }.price {
          position: absolute;
          right: 90px;
          bottom: 12px;
          line-height: 24px;
          font-size: 14px;
          font-weight: 700;
          color: rgb(240, 20, 20);
        }.cartcontrol-wrapper {
          position: absolute;
          right: 0;
          bottom: 6px;
        }
      }
    }
  }
}.list-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 40;
  backdrop-filter: blur(10px);
  opacity: 1;
  background: rgba(7, 17, 27, 0.6);&.fade-enter-active, &.fade-leave-active {
    transition: all 0.5s;
  }&.fade-enter, &.fade-leave-to {
    opacity: 0;
    background: rgba(7, 17, 27, 0);
  }
}

</style>
